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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A291818 G.f. A(x) satisfies: A(x - 4*x*A(x)) = x - x*A(x).

Table of values

n a(n)
1 1
2 3
3 33
4 519
5 9969
6 218907
7 5307201
8 139123215
9 3889995297
10 114928234611
11 3563543673825
12 115375173490839
13 3885328265571345
14 135675583665864843
15 4900856792035006593
16 182756242210436579871
17 7023982500750575903553
18 277842871320960134512611
19 11297961688442941015761825
20 471773677417286920645721895
21 20211597594930636918024401457
22 887652829316087359743197592315

List of values

[1, 3, 33, 519, 9969, 218907, 5307201, 139123215, 3889995297, 114928234611, 3563543673825, 115375173490839, 3885328265571345, 135675583665864843, 4900856792035006593, 182756242210436579871, 7023982500750575903553, 277842871320960134512611, 11297961688442941015761825, 471773677417286920645721895, 20211597594930636918024401457, 887652829316087359743197592315]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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